/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { Directive, Output, Input, EventEmitter } from '@angular/core';
import { Directionality, _resolveDirectionality } from './directionality';
import * as i0 from "@angular/core";
/**
 * Directive to listen for changes of direction of part of the DOM.
 *
 * Provides itself as Directionality such that descendant directives only need to ever inject
 * Directionality to get the closest direction.
 */
export class Dir {
    constructor() {
        /** Normalized direction that accounts for invalid/unsupported values. */
        this._dir = 'ltr';
        /** Whether the `value` has been set to its initial value. */
        this._isInitialized = false;
        /** Event emitted when the direction changes. */
        this.change = new EventEmitter();
    }
    /** @docs-private */
    get dir() {
        return this._dir;
    }
    set dir(value) {
        const previousValue = this._dir;
        // Note: `_resolveDirectionality` resolves the language based on the browser's language,
        // whereas the browser does it based on the content of the element. Since doing so based
        // on the content can be expensive, for now we're doing the simpler matching.
        this._dir = _resolveDirectionality(value);
        this._rawDir = value;
        if (previousValue !== this._dir && this._isInitialized) {
            this.change.emit(this._dir);
        }
    }
    /** Current layout direction of the element. */
    get value() {
        return this.dir;
    }
    /** Initialize once default value has been set. */
    ngAfterContentInit() {
        this._isInitialized = true;
    }
    ngOnDestroy() {
        this.change.complete();
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: Dir, deps: [], target: i0.ɵɵFactoryTarget.Directive }); }
    static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.1", type: Dir, selector: "[dir]", inputs: { dir: "dir" }, outputs: { change: "dirChange" }, host: { properties: { "attr.dir": "_rawDir" } }, providers: [{ provide: Directionality, useExisting: Dir }], exportAs: ["dir"], ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: Dir, decorators: [{
            type: Directive,
            args: [{
                    selector: '[dir]',
                    providers: [{ provide: Directionality, useExisting: Dir }],
                    host: { '[attr.dir]': '_rawDir' },
                    exportAs: 'dir',
                }]
        }], propDecorators: { change: [{
                type: Output,
                args: ['dirChange']
            }], dir: [{
                type: Input
            }] } });
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